An archaic unit of liquid volume measurement, equivalent to one-eighth of a fluid ounce or about 3.7 milliliters.
Compound of 'fluid' and 'drachm' (from Greek 'drachme' meaning a small weight). This unit was primarily used in pharmacy and medicine, particularly before the metric system became standard.
Pharmacists in the 1800s used fluid drachms to measure medicine doses with impressive precision—using tiny glass measures called drachm measures. It's why old medicine bottles sometimes showed measurements like 'one fluidrachm three times daily.'
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